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STOCKHOLDERS' EQUITY (Details 6) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Stock-Based Compensation Expense |  |  |
Stock-based compensation expense included in operating expenses | $ 4,435,000 | $ 5,311,000 | $ 15,249,000
Stock options |  |  |
Stock-Based Compensation Expense |  |  |
Option vesting period | 4 years |  |
Stock-based compensation expense related to extension of the post-termination exercise period | 205,000 |  |
Research and development |  |  |
Stock-Based Compensation Expense |  |  |
Stock-based compensation expense included in operating expenses | 1,741,000 | 2,336,000 | 5,799,000
Restructuring charges |  |  |
Stock-Based Compensation Expense |  |  |
Stock-based compensation expense included in operating expenses | 28,000 | 107,000 | 174,000
General and administrative |  |  |
Stock-Based Compensation Expense |  |  |
Stock-based compensation expense included in operating expenses | $ 2,666,000 | $ 2,868,000 | $ 9,276,000

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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